(Java) SendGrid HTML Email with Embedded Images

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Demonstrates how to send an HTML email with embedded images using SendGrid.

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import com.chilkatsoft.*;

public class ChilkatExample {

  static {
    try {
        System.loadLibrary("chilkat");
    } catch (UnsatisfiedLinkError e) {
      System.err.println("Native code library failed to load.\n" + e);
      System.exit(1);
    }
  }

  public static void main(String argv[])
  {
    // This requires the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code

    CkHttpRequest req = new CkHttpRequest();
    CkHttp http = new CkHttp();

    boolean success;

    // First.. load a JPG file and build an HTML img tag with the JPG data inline encoded.
    // Our HTML img tag will look like this:
    // <img src="data:image/jpeg;base64,/9j/4AAQSkZJRgABAQEA3ADcAA..." alt="" style="border-width:0px;" />
    CkBinData bdJpg = new CkBinData();
    success = bdJpg.LoadFile("qa_data/jpg/starfish.jpg");
    if (success == false) {
        System.out.println("Failed to load JPG file.");
        return;
        }

    // Note: HTML containing embedded base64 image data may not be visible in all email clients.
    // For example, GMail might not display the image, but viewing in Outlook might be OK.
    CkStringBuilder sbHtml = new CkStringBuilder();
    sbHtml.Append("<html><body><b>This is a test<b><br /><img src=\"data:image/jpeg;base64,");
    // Append the base64 image data to sbHtml.
    bdJpg.GetEncodedSb("base64",sbHtml);
    sbHtml.Append("\" alt=\"\" style=\"border-width:0px;\" /></body></html>");

    CkJsonObject json = new CkJsonObject();
    json.UpdateString("personalizations[0].to[0].email","matt@chilkat.io");
    json.UpdateString("personalizations[0].to[0].name","Matt");
    json.UpdateString("from.email","admin@chilkatsoft.com");
    json.UpdateString("subject","Test HTML email with images");
    json.UpdateString("content[0].type","text/html");
    json.UpdateSb("content[0].value",sbHtml);

    http.put_AuthToken("SENDGRID_API_KEY");

    CkHttpResponse resp;
    resp = http.PostJson3("https://api.sendgrid.com/v3/mail/send","application/json",json);
    if (http.get_LastMethodSuccess() != true) {
        System.out.println(http.lastErrorText());
        }
    else {
        System.out.println("response status code: " + resp.get_StatusCode());
        // Display the response.
        // If successful, the response code is 202 and the response body string is empty.
        // (The response body string may also be empty for error response codes.)
        System.out.println(resp.bodyStr());

        }
  }
}